Forwards Joe Hugill and Charlie McNeill have both agreed long-term contracts after enjoying successful first seasons in the Academy.
Goalkeeper Paul Woolston has signed a one-year deal and will begin his fourth season with United.
Hugill has spent the last week with the first-team at their training camp in Surrey while McNeill and Woolston have been preparing for the new campaign with the Academy group up in Edinburgh.
Woolston will continue to be a great influence on his team-mates both on and off the pitch. He played nine times for the Under-23s during the 2020/21 season and will once again be a pivotal part of the Academy’s goalkeeper group.